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Fault finding and diagnosis
Description
2967 B
Flow/heat exchanger temperature sensor
differential too great
2972 –
Mains voltage too low
2973 –
System fault boiler electronics / basic
controller
2974 –
Internal fault
2980
V
Locking fault: To unlock Hold up and down
2981
V
arrow keys pressed simultaneously for 3 s.
For more information see operating instr.
(Boiler locked. Contact a qualified heating
engineer)
Table 34 Indicators and fault displays
94
Remedy
▶ Check the flow through the appliance and the system is filled.
▶ Check for air locks in the system and purge if required.
▶ Check the isolation valves.
▶ Check the pump is operating freely and check the voltage to the pump.
▶ Check the heat exchanger sensor and the flow sensor are making contact with the
pipework.
▶ Check the heat exchanger sensor and the resistance of the temperature sensor and
replace if required.
▶ Check the continuity of harness and replace if required.
Check the mains voltage on the appliance (L and N).
▶ Perform factory reset.
▶ Check and replace control unit.
▶ Restart the appliance and check if fault remains.
▶ Check and replace control unit.
▶ After power cycle 2980 will switch to 2981.
▶ Diagnose and remedy the locking fault. Check the complete system, including sensors
and harnesses.
▶ When remedied and system checked, turn the boiler power off and on again.
▶ Fault condition 2980/2981 will appear, the boiler is still in super lock-out.
▶ Press and simultaneously for 3 seconds.
▶ Immediately after 22 seconds have elapsed, perform an additional reset by pressing
and simultaneously for 3 seconds.
▶ Super lock-out is remedied, boiler returns to normal operating condition.
▶ Fault history is now available, double check the last 10 faults to confirm the fault has
been remedied.
Greenstar 1000 – 6721835943 (2023/08)
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